Locomotive crosshead



- strongand durable and of simple andr economical construction. 'I 'he invention consists in the. crosshead and inv the;v parts and combinations and".

Paenied' Apr. 14, Y1936 Y '15amv v.v Buckvlier, canton, ohiofassignofto The Tlmken Roller Bearing Company Canton,

L.This invention relates to crossheads, particularly crossheads of; the type used on'locomotives j yfor c ori'rlectirigthel main rod to the piston rod. f

It has for' its principal object to provide a crossihead which can be quickiy'andeasily removed and rreplacedwwithout removing the wrist pin from` the main'rodfand whichv will be light in weight,

V'arrangements of `parts hereinafter described and claimed` `--iin' Fig. 2.

-In the accompanying drawing, which Aforms a part of this specification and whereinl like sym-jl bols reiento .like parts Wherever they occur, v

Fig. l is apart planfand part horizontalsec#A tional` viewcf a locomotive crosshead embodying my invention, v Fig. 2 is aside'elev'ation of said cro'sshead,

Fig. 3 is a vertical crossfsection on the'linefr u tothe outer face ofsaid branchiwith its innermar- ".ginal portion loverlapping the outer end of said 3 4 in Fig. 2;*'and` ,Y

Fig. 411s aQvertical The present crosshead is particularly adaptedl -ior transferring thereciprocating motionA vo1' the piston rod A of ``L-locori'1otive to the main `orgccnvnecting rod B thereof. .Said crossheadcomprises .aforked or yoke memberl Cr having a shankr` porl tion vi provided with a longitudinalnborafwhich f receivesthe` rear end l'portion of the piston rod A; vand horizontally 4spaced parallel branches Z,j`be` ytweenwhi'ch the forward end of the main rod B va chamber or reservoir `thereinrdor lubricant.

. islpivotally secured by means of a horizontal wrist pin 3.tha't extends transversely `of said branches. @The branches 2 of theyoke men'ibei` C and the y portion of the main rodBudisposed'therebetween are providedwith alined openings adapted to re- -celve the wrist pin 3.' The middle'portion ofithe wrist pinl is vcylindricalv 'and basa tightiit in the openingin the mainrcd; and vthe ends of said wrist pin are rotatably supported in vthe openings j in the respectivebranches of the yoke member.' t,"Ihe piston rod A comprises a cylindrical tube having anenlarged rear end portion [which ilts within the vcylindrical bore in the shankportion Iof the crosshead. Relative endvvise.y movement of the pistonrod A'andyoke member C is pre-` ventedby means of a series of outstandingfan` nular ribs 5 on the enlarged end 4 of the piston rod that mate with corresponding annular'` grooves 6 in the'vbore of the shank portion I of the yoke member. These interfitting ribs and grooves are preferably provided with tapered side faces that cross-section on thev lineA flower. than the remaining ribs and grooves-in 5v order to avoid weakening the piston rod at lsaid point.l

Trie wrist'pm 3 suppor'tedfat its liter?*ends`v` in antifriction bearings, .preferably taper.v roller bearings, mounted `in the-registering openings in 10 'thejbranchesfof l"the yoke ymember C H Each oi' the taper rollerbearings comprises a series of conical bearingrollersl interposed. between a "conical inner racewayl Y8 formedon the Vwrist pin itself and a conical cupor outer bearing memberv 15 9 seated 4`Within the vopening inthe vadjacent f ybranch of lthefyoke member; The outer bearing member 9 is heldin the opening providedtherei'or inthe branch ofv the yoke member by,v means of an annular plate Ill` that is removably secured` 20 isaccomplished.DreferablyJ-by thin shims Il in- 25 terposed between *the"annularplateV l0 and the branch of the kyoke member. Endwise; movement v of the wrist pin is prevented bythe engagement 'of the conical bearingffrollers with the conical raceways v'8 `onjthe wristapin and; the retaining: 30

plates I0 at the outer ends ofthe bearings;

The wrist pin 3 is made hollow sol aste providey The inner end of the wrist pin fis closed by means of a closure member in the'fcrm of a threaded 35 .'plu'g I 2; andthegouter4 end ofsaid pin is closed by means of a threaded capl3prov ided with a siiitable oil-feed iittingvld. The Awrist pin isgpro- `vided-With radial-'lubricant passageways I 5 leading fromthe interior thereof `to the outer end 0i.' -40 eachconical'raceway portion, 8 of said pin. With thlsarrangement, the movement of the wrist pinV causes the lubricant thereinto-pass out through radial-passageways i5 into the `space occupied,

by the bearingrollers 1*. 45 The yoke member C is provided with top and bottom shoes E adapted-to slide on parallel ways or guides (not shown). VEach shoe E is substantially of channel-shaped cross-section; that is it comprises a horizontal web portion .i6 provided 5 0 e Von one sidewith spaced parallel iianges I1, which extend between the branches 2 ofthe yoke memberC, and on the othersidewith spaced parallel flanges I8 adapted to straddle the spaced parailel ways or guides; vThe anges I1 of each shoe 55 duplicate half sections, shank portion of The two half sections of the yoke member C are se-l cured together by horizontal crossbolts-ZIJ that serve to firmly clamp the mating portions of the shank I about the enlarged rear end portion I of the piston rod A, with'the tapered ribs and grooves of said shank and piston in wedging engagement with each other. 1

The foregoing crosshead construction has numerous advantages. The forming of the yoke member C-in separable sections permits the removal' of the yoke `memberand theV wrist pin v bearings without removing the wrist pin from the "openingsin said branches for rotatably supportf` y 4 ing the endsof thefwrist pin therein, said yoke i tween lsaid branches, Va wrist main rod B by merely removing vthe ,boltshl which secure the yoke sections together, and the i bolts 20, which secure theshoes F to the branches of the yoke member. The shoes act both asstrnts and ties for maintaining shoes and yoke" member, being separable, are adapted to be'made of materials best suited for the duty imposed thereon. "The clamping engagement ofthe tapered intertting ribs 5 and grooves 6 of the' piston rod and yoke forms a strong and rigid connection between said parts, which dispenses with the use of cross keys for connecting these parts together and permits the piston rod-to be made from tubestock instead of the solid stock hereinbefore employed.

Inladdition tobeing much lighter and muchy stronger than previous crossheads, my crosshead has `the great advantage r,of being Well adapted to manufacture -by drop-forging and well adapted to heat treatment. The yoke member, being made of duplicate half sections, requires the -use of onlyone forging die. i v

Obviously, the hereinbefore described crosshead construction admits of kconsiderable modification without departing from the invention.V Therefore, JI fdo not Awish to Abe limited to the` precise construction shown `and described.-

What I claim is: Y l. A crosshead comprising bular shank portion and spaced branches provided with alined openings, amember interposed beings in said branches, androller bearings in the the, axis of itspiston rod I ber, and ,roller bearings inthe openings in said the branches of vthe yoke y. members in proper spaced relation andare readily detachable for repair or replacement without` affecting the other parts of the crosshead.y The` v Y tions, and means a yoke having a tu- A pin' having a-,tight L `t in an opening provided therefor in saidfrnember and having its endsiextending intogthe open-` being made of separable sections, thereby permitting the removal of said yoke without removing said wrist pin from saidmember.

2. A crosshead comprising a yoke having a tubular shank portion and `spaced branches provided with allned openings, a member interposed between saidbranches, a wrist pin having a tight fit in an opening provided therefor in said mem- 'branches for rotatably supporting the ends of the Vwrist pin therein, said yoke being split longitudinally so as to permit removal thereof vwithloutremoving the wrist pin from said member.

3. A locomotive crosshead comprising a yoke having a tubular j shank i portion and ,spaced branches provided with. registering openings, a

piston rod extending into said shank portion, and

a 4main rod vinterposed( between said spaced branches and having a wrist pin rigid therewith with its ends disposed in said openings, the bore of said shank portion and the portion of the piston rod engaged therewith having Yinteriitting annnlarribs andr g'rooves,'said yoke being made .of separable sectionsgthereby and m'eans permitting the removal and replacement of said yoke member without disturbing saidlpin.'

4. A locomotivel crosshead comprising a yoke member having a tubular shank 4portionV and spaced branches provided with openings, a piston rod extending into said shanky portion, a main rod interposedY between said branches, a wrist pin having a tight t in an openm'gprovidedtherefor in said main rod and having its ends extending into `the openingsin" said branches, said shank portion being split longitudinally to,form' secfor ,clamping said sections around said piston rod. i l,

5. A locomotive crosshead comprising Vva yoke ortion and spaced having Ya tubular shank p branches provided with alinedopenings, a tubullarpiston rod extending linto said tubular shank portions, a main rod interposed'between said branches, awrist pin having a tight iit in said main rod and extending into the openings in said. branches,` said shank portion being split longitudinally, andmeansfor clamping the split portions of said shank portion'a'ro'und said tubular piston rod.

` 6. A locomotive crosshead comprising a' vyoke having `af tubular shank portion and `spaced branches provided with'alined openings, a -tubu'- lar piston rod extending intosaid tubular shank portion, a vmainv rod interposedv lbetween said branches a wrist pin'having a'tight fit in said main rodand extending into the' openings in said branches, said shank portionbeing splitv longitudinally, and meansior clamping'l thev split portionsV of. said shank portion around said tubular piston rod, the"cooperating surfaces of said yshank portionr and said piston rod'beingrprovided v with cooperating ribs and groovesl TRACY VQBUCKWALTER.

CERTIFICATE 0E CORRECTION.

Patent No. 2,037,209. K ,April 14, 195e.

TRACY v. BUCKwALTER.

It is herebyl Certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, second column, line 24, claim 5, strike out the words "and means"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealedv this 12th day of May, A. D. 1956.

v Leslie Frazer (Seal) Aoting Commissioner of Patents. 

